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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Tax credit carryforwards $ 11,380 $ 19,529
Pension, compensation, and other employee benefits 22,868 23,212
Provisions for losses 10,235 11,119
Net operating loss carryforward 5,023 4,310
State income taxes 3,790 2,944
Other deferred income tax assets 5,020 3,456
Total deferred tax assets 58,316 64,570
Valuation allowance (3,998) (2,837)
Foreign deferred tax assets included above (1,972) (2,460)
Net deferred tax assets 52,346 59,273
Deferred tax liabilities:    
Property and equipment (3,299) (3,510)
Deferred tax related to life insurance (5,642) (5,316)
Goodwill and other intangible assets (4,535) (4,038)
Other deferred income tax liabilities (557) (1,115)
Total deferred tax liabilities (14,033) (13,979)
Foreign deferred tax liabilities included above 2,852 3,471
United States net deferred tax assets $ 41,165 $ 48,765